This lesson helps introduce students to the concept that temperature causes molecules and atoms to move faster and farther apart, which in turn causes the change from solid to liquid, and liquid to gas.

This tool includes printable calendars where you can record your observations of the moon. In addition, it provides illustrations of the phases of the moon (a full lunar cycle) that can be printed and cut out for a hands-on activity where you can place the phases of the moon in the correct order on a calendar.